Pauses or resumes playback.
Begins playing the playlist at song number songPos.
Optional
songPos: numberBegins playing the playlist at song with the given songId.
Plays the previous song in the playlist.
Seeks to the position time (in seconds; fractions allowed) of entry songPos in the playlist.
Seeks to the position time (in seconds; fractions allowed) within the current song. If relative is true, then the time is relative to the current playing position.
Seeks to the position time (in seconds; fractions allowed) of song with the given songId.
Stops playing.
Plays the next song in the playlist.